+ MODEL_EXPORT virtual const ModelAPI_Validator* validator(const std::string& theID) const;
+
+ /// Returns true if feature and all its attributes are valid.
+ MODEL_EXPORT virtual bool validate(const std::shared_ptr<ModelAPI_Feature>& theFeature) const;
+
+ /// register that this attribute in feature is not obligatory for the feature execution
+ /// so, it is not needed for the standard validation mechanism
+ virtual void registerNotObligatory(std::string theFeature, std::string theAttribute);
+
+ /// Returns true if the attribute in feature is not obligatory for the feature execution
+ virtual bool isNotObligatory(std::string theFeature, std::string theAttribute);
+
+ /// register that this attribute conceals in the object browser
+ /// all referenced features after execution
+ virtual void registerConcealment(std::string theFeature, std::string theAttribute);